Drop support for ixmp/message-ix version 3.6

…according to the version policy.

.github/workflows/pytest.yaml

@@ -75,8 +75,7 @@ jobs:
         # - Latest supported Python version for those or other dependencies.
         # Minimum version given in pyproject.toml + earlier version of Python
         # For this job only, the oldest version of Python supported by message-ix-models
-        - { upstream: v3.6.0, python: "3.9" }  # Released 2022-08-18
-        - { upstream: v3.7.0, python: "3.11" }  # 2023-05-17
+        - { upstream: v3.7.0, python: "3.9" }  # Released 2023-05-17
         - { upstream: v3.8.0, python: "3.12" }  # 2024-01-12
         # Latest released version + latest released Python
         - { upstream: v3.9.0, python: "3.13" }  # 2024-06-04
@@ -86,7 +85,6 @@ jobs:
         exclude:
         # Specific version combinations that are invalid / not to be used
         # These versions of ixmp are not able locate the arm64 GAMS API binaries
-        - { os: macos-latest, version: { upstream: v3.6.0 }}
         - { os: macos-latest, version: { upstream: v3.7.0 }}
         - { os: macos-latest, version: { upstream: v3.8.0 }}
         - { os: macos-latest, version: { upstream: v3.9.0 }}
@@ -133,9 +131,6 @@ jobs:
 
         v, result = "${{ matrix.version.upstream }}".replace("main", "vmain"), []
         for condition, dependency in (
-            (v <= "v3.6.0", "dask < 2024.3.0"),  # dask[dataframe] >= 2024.3.0 requires dask-expr and in turn pandas >= 2.0 (#156)
-            (v <= "v3.6.0", "numpy < 2.0"),
-            (v <= "v3.6.0", "pandas < 2.0"),
             (v >= "v3.7.0", "dask[dataframe] < 2024.11.0"),  # dask >= 2024.11.0 changes handling of dict (will be addressed in #225)
             (v <= "v3.7.0", "genno < 1.25"),  # Upstream versions < 3.8.0 import genno.computations, removed in 1.25.0 (#156)
             (v < "v3.9.0", "pytest == 8.0.0"),  # Upstream versions < 3.9.0 use a hook argument removed in pytest 8.1.0 (#155)

doc/whatsnew.rst

@@ -4,8 +4,8 @@ What's new
 Next release
 ============
 
-- Support for :mod:`ixmp` and :mod:`message_ix` versions 3.4.x and 3.5.x is dropped in accordance with the :ref:`policy-upstream-versions` (:pull:`288`).
-  The minimum version of both packages is 3.6.0.
+- Support for :mod:`ixmp` and :mod:`message_ix` versions 3.4, 3.5, and 3.6 is dropped in accordance with the :ref:`policy-upstream-versions` (:pull:`288`, :pull:`289`).
+  The minimum version of both packages is 3.7.0.
 - Update :class:`.IEA_EWEB` to support :py:`transform="B"` / :func:`.transform_B` (:issue:`230`, :pull:`259`).
 - Add :func:`.prepare_method_B` to :mod:`.ssp.transport` (:pull:`259`).
 - New utility :class:`.sdmx.AnnotationsMixIn` (:pull:`259`).

pyproject.toml

@@ -37,7 +37,7 @@ dependencies = [
   # message_ix >= 3.4.0 → ixmp >= 3.4.0 → genno >= 1.6.0",
   "genno >= 1.28.1",
   "iam_units >= 2023.9.11",
-  "message_ix >= 3.6.0",
+  "message_ix >= 3.7.0",
   "pooch",
   "pyam-iamc >= 0.6",
   "pyarrow",